Which test is NOT typically performed on samples from a Lavender tube?

The correct choice is identified because a crossmatch test is typically performed using samples from a different color tube, usually a red or a pink top tube. These tubes are designed to collect serum, which is required for crossmatching blood, often involving compatibility testing prior to a transfusion.

In contrast, lavender top tubes contain EDTA, an anticoagulant that is ideal for tests requiring whole blood or plasma. The tests commonly run from lavender tubes include a complete blood count, hematocrit tests, and blood glucose tests. These tests rely on the preserved cellular components that EDTA provides, making them unsuitable for crossmatching, which needs serum free of cellular material.